A Dozen, a Gross, and a Score,
plus three times the square root of four,
divided by seven,
plus five times eleven,
is nine squared and not a bit more.

A second one, from (requires "zee" rather than "zed" for the last letter of the alphabet):

Integral z-squared dz
from 1 to the cube root of 3
times the cosine
of three pi over 9
equals log of the cube root of e.